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php加密算法

2024-07-16 11:40:36   221人阅读

class DES{    var $key;    function DES() {        $this->key = md5("EPH e-Textbook");        $this->key = "".$this->key;        $this->key = strtoupper($this->key);        $this->key = substr($this->key,0,8);    }    function encrypt($str) {        $block = mcrypt_get_block_size(‘des‘, ‘ecb‘);        $pad = $block - (strlen($str) % $block);        $str .= str_repeat(chr($pad), $pad);        return strtoupper(bin2hex(mcrypt_encrypt(MCRYPT_DES, $this->key, $str, MCRYPT_MODE_ECB)));    }    function decrypt($str){        $str = $this->hex2bin($str);        $str = mcrypt_decrypt(MCRYPT_DES, $this->key, $str, MCRYPT_MODE_ECB);        $block = mcrypt_get_block_size(‘des‘, ‘ecb‘);        $pad = ord($str[($len = strlen($str)) - 1]);        return substr($str, 0, strlen($str) - $pad);    }    //兼容hex2bin    function hex2bin( $str ){        $old = (version_compare(PHP_VERSION,  ‘5.4.0‘) <= 0) ? true : false;        if($old){            $sbin = "";            $len = strlen( $str );            for ( $i = 0; $i < $len; $i += 2 ) {                $sbin .= pack( "H*", substr( $str, $i, 2 ) );            }        }else{            return hex2bin($str);        }        return $sbin;    }}



class Es_encrypt {        private $expire = 0, $key = ‘pl_esmart_1.6‘;    public function __construct($key_str = null, $time_to_live = null) {        if ($key_str) {            self::setKey($key_str);        }        if ($time_to_live) {            self::setExpire($time_to_live);        }    }    public  function setExpire($time_to_live) {        $this->expire = floatval($time_to_live);    }    public function setKey($key_str) {        $this->key = (string) $key_str;    }    public function encode($tex, $key = null, $expire = 0) {        $key = $key ? $key : $this->key;        $expire = $expire ? $expire : $this->expire;        $chrArr = array(‘a‘, ‘b‘, ‘c‘, ‘d‘, ‘e‘, ‘f‘, ‘g‘, ‘h‘, ‘i‘, ‘j‘, ‘k‘, ‘l‘, ‘m‘, ‘n‘, ‘o‘, ‘p‘, ‘q‘, ‘r‘, ‘s‘, ‘t‘, ‘u‘, ‘v‘, ‘w‘, ‘x‘, ‘y‘, ‘z‘,            ‘A‘, ‘B‘, ‘C‘, ‘D‘, ‘E‘, ‘F‘, ‘G‘, ‘H‘, ‘I‘, ‘J‘, ‘K‘, ‘L‘, ‘M‘, ‘N‘, ‘O‘, ‘P‘, ‘Q‘, ‘R‘, ‘S‘, ‘T‘, ‘U‘, ‘V‘, ‘W‘, ‘X‘, ‘Y‘, ‘Z‘,            ‘0‘, ‘1‘, ‘2‘, ‘3‘, ‘4‘, ‘5‘, ‘6‘, ‘7‘, ‘8‘, ‘9‘);        $tex.="~#~" . sprintf(‘%010d‘, $expire ? $expire + time() : 0) . "~#~";        $key_b = $chrArr[rand() % 62] . $chrArr[rand() % 62] . $chrArr[rand() % 62] . $chrArr[rand() % 62] . $chrArr[rand() % 62] . $chrArr[rand() % 62];        $rand_key = $key_b . $key;        $rand_key = md5($rand_key);        $texlen = strlen($tex);        $reslutstr = "";        for ($i = 0; $i < $texlen; $i++) {            $reslutstr.=$tex{$i} ^ $rand_key{$i % 32};        }        $reslutstr = trim($key_b . base64_encode($reslutstr), "==");        $reslutstr = substr(md5($reslutstr), 0, 8) . $reslutstr;        return $reslutstr;    }    public function decode($tex, $key = null) {        $key = $key ? $key : $this->key;        if (strlen($tex) < 14)            return false;        $verity_str = substr($tex, 0, 8);        $tex = substr($tex, 8);        if ($verity_str != substr(md5($tex), 0, 8)) {            //完整性验证失败            return false;        }        $key_b = substr($tex, 0, 6);        $rand_key = $key_b . $key;        $rand_key = md5($rand_key);        $tex = base64_decode(substr($tex, 6));        $texlen = strlen($tex);        $reslutstr = "";        for ($i = 0; $i < $texlen; $i++) {            $reslutstr.=$tex{$i} ^ $rand_key{$i % 32};        }        $expiry_arr = array();        preg_match(‘/^(.*)~#~(\d{10})~#~$/‘, $reslutstr, $expiry_arr);        if (count($expiry_arr) != 3) {            //过期时间完整性验证失败            return false;        } else {            $tex_time = $expiry_arr[2];            if ($tex_time > 0 && $tex_time - time() <= 0) {                //验证码过期                return false;            } else {                $reslutstr = $expiry_arr[1];            }        }        return $reslutstr;    }            //密碼加密    function encrypt($data){        $key    =    md5($this->key);        $x        =    0;        $len    =    strlen($data);        $l        =    strlen($key);        $char = $str = ‘‘;        for ($i = 0; $i < $len; $i++){            if ($x == $l){                $x = 0;            }            $char .= $key{$x};            $x++;        }        for ($i = 0; $i < $len; $i++){            $str .= chr(ord($data{$i}) + (ord($char{$i})) % 256);        }        return base64_encode($str);    }        function decrypt($data){        $key = md5($this->key);        $x = 0;        $data = base64_decode($data);        $len = strlen($data);        $l = strlen($key);        $char = $str = ‘‘;        for ($i = 0; $i < $len; $i++){            if ($x == $l)    {                $x = 0;            }            $char .= substr($key, $x, 1);            $x++;        }        for ($i = 0; $i < $len; $i++){            if (ord(substr($data, $i, 1)) < ord(substr($char, $i, 1))){                $str .= chr((ord(substr($data, $i, 1)) + 256) - ord(substr($char, $i, 1)));            }else{                $str .= chr(ord(substr($data, $i, 1)) - ord(substr($char, $i, 1)));            }        }        return $str;    }}
 
 
 






























        

            
                
                  
                
                

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